| 31 Aug 18 | r01        | OspreysOspreys | 17 - 13 | EdinburghEdinburgh |
| 31 Aug 18 | r01        | Cardiff BluesCardiff Blues | 32 - 33 | LeinsterLeinster |
| 31 Aug 18 | r01        | ZebreZebre | 32 - 16 | Southern KingsSouthern King |
| 01 Sep 18 | r01        | DragonsDragons | 17 - 21 | BenettonBenetton |
| 01 Sep 18 | r01        | ConnachtConnacht | 26 - 27 | GlasgowGlasgow |
| 01 Sep 18 | r01        | MunsterMunster | 38 - 0 | CheetahsCheetahs |
| 01 Sep 18 | r01        | UlsterUlster | 15 - 13 | ScarletsScarlets |
| |
| 07 Sep 18 | r02        | GlasgowGlasgow | 25 - 10 | MunsterMunster |
| 07 Sep 18 | r02        | UlsterUlster | 30 - 29 | EdinburghEdinburgh |
| 08 Sep 18 | r02        | BenettonBenetton | 27 - 25 | Cardiff BluesCardiff Blues |
| 08 Sep 18 | r02        | DragonsDragons | 27 - 22 | Southern KingsSouthern King |
| 08 Sep 18 | r02        | ConnachtConnacht | 32 - 13 | ZebreZebre |
| 08 Sep 18 | r02        | OspreysOspreys | 46 - 14 | CheetahsCheetahs |
| 08 Sep 18 | r02        | ScarletsScarlets | 23 - 21 | LeinsterLeinster |
| |
| 14 Sep 18 | r03        | EdinburghEdinburgh | 17 - 10 | ConnachtConnacht |
| 14 Sep 18 | r03        | MunsterMunster | 49 - 13 | OspreysOspreys |
| 15 Sep 18 | r03        | ScarletsScarlets | 38 - 29 | BenettonBenetton |
| 15 Sep 18 | r03        | LeinsterLeinster | 52 - 10 | DragonsDragons |
| 15 Sep 18 | r03        | CheetahsCheetahs | 24 - 52 | GlasgowGlasgow |
| 15 Sep 18 | r03        | ZebreZebre | 26 - 24 | Cardiff BluesCardiff Blues |
| 16 Sep 18 | r03        | Southern KingsSouthern King | 7 - 28 | UlsterUlster |
| |
| 21 Sep 18 | r04        | CheetahsCheetahs | 39 - 39 | UlsterUlster |
| 21 Sep 18 | r04        | Cardiff BluesCardiff Blues | 37 - 13 | MunsterMunster |
| 22 Sep 18 | r04        | OspreysOspreys | 27 - 10 | BenettonBenetton |
| 22 Sep 18 | r04        | Southern KingsSouthern King | 38 - 28 | GlasgowGlasgow |
| 22 Sep 18 | r04        | DragonsDragons | 16 - 5 | ZebreZebre |
| 22 Sep 18 | r04        | ConnachtConnacht | 33 - 20 | ScarletsScarlets |
| 22 Sep 18 | r04        | LeinsterLeinster | 31 - 7 | EdinburghEdinburgh |
| |
| 28 Sep 18 | r05        | EdinburghEdinburgh | 31 - 30 | BenettonBenetton |
| 28 Sep 18 | r05        | Cardiff BluesCardiff Blues | 24 - 21 | CheetahsCheetahs |
| 29 Sep 18 | r05        | ZebreZebre | 8 - 22 | OspreysOspreys |
| 29 Sep 18 | r05        | ConnachtConnacht | 3 - 20 | LeinsterLeinster |
| 29 Sep 18 | r05        | ScarletsScarlets | 54 - 14 | Southern KingsSouthern King |
| 29 Sep 18 | r05        | GlasgowGlasgow | 29 - 13 | DragonsDragons |
| 29 Sep 18 | r05        | MunsterMunster | 64 - 7 | UlsterUlster |
| |
| 05 Oct 18 | r06        | EdinburghEdinburgh | 37 - 21 | CheetahsCheetahs |
| 05 Oct 18 | r06        | GlasgowGlasgow | 36 - 8 | ZebreZebre |
| 05 Oct 18 | r06        | UlsterUlster | 15 - 22 | ConnachtConnacht |
| 06 Oct 18 | r06        | BenettonBenetton | 28 - 5 | Southern KingsSouthern King |
| 06 Oct 18 | r06        | ScarletsScarlets | 20 - 17 | OspreysOspreys |
| 06 Oct 18 | r06        | DragonsDragons | 15 - 23 | Cardiff BluesCardiff Blues |
| 06 Oct 18 | r06        | LeinsterLeinster | 30 - 22 | MunsterMunster |
| |
| 26 Oct 18 | r07        | Southern KingsSouthern King | 34 - 41 | ScarletsScarlets |
| 26 Oct 18 | r07        | ZebreZebre | 34 - 16 | EdinburghEdinburgh |
| 26 Oct 18 | r07        | UlsterUlster | 36 - 18 | DragonsDragons |
| 26 Oct 18 | r07        | OspreysOspreys | 22 - 17 | ConnachtConnacht |
| 27 Oct 18 | r07        | BenettonBenetton | 3 - 31 | LeinsterLeinster |
| 27 Oct 18 | r07        | MunsterMunster | 25 - 24 | GlasgowGlasgow |
| 27 Oct 18 | r07        | CheetahsCheetahs | 21 - 10 | Cardiff BluesCardiff Blues |
| |
| 02 Nov 18 | r08        | EdinburghEdinburgh | 31 - 21 | ScarletsScarlets |
| 02 Nov 18 | r08        | OspreysOspreys | 20 - 29 | GlasgowGlasgow |
| 03 Nov 18 | r08        | BenettonBenetton | 10 - 15 | UlsterUlster |
| 03 Nov 18 | r08        | ConnachtConnacht | 33 - 12 | DragonsDragons |
| 04 Nov 18 | r08        | CheetahsCheetahs | 26 - 30 | MunsterMunster |
| 04 Nov 18 | r08        | Cardiff BluesCardiff Blues | 37 - 0 | ZebreZebre |
| 04 Nov 18 | r08        | Southern KingsSouthern King | 31 - 38 | LeinsterLeinster |
| |
| 23 Nov 18 | r09        | ScarletsScarlets | 29 - 12 | UlsterUlster |
| 23 Nov 18 | r09        | LeinsterLeinster | 52 - 7 | OspreysOspreys |
| 23 Nov 18 | r09        | GlasgowGlasgow | 40 - 15 | Cardiff BluesCardiff Blues |
| 24 Nov 18 | r09        | CheetahsCheetahs | 31 - 25 | BenettonBenetton |
| 25 Nov 18 | r09        | Southern KingsSouthern King | 14 - 31 | ConnachtConnacht |
| 25 Nov 18 | r09        | ZebreZebre | 7 - 32 | MunsterMunster |
| 25 Nov 18 | r09        | DragonsDragons | 18 - 12 | EdinburghEdinburgh |
| |
| 30 Nov 18 | r10        | MunsterMunster | 44 - 14 | EdinburghEdinburgh |
| 30 Nov 18 | r10        | OspreysOspreys | 43 - 0 | ZebreZebre |
| 01 Dec 18 | r10        | Southern KingsSouthern King | 19 - 22 | BenettonBenetton |
| 01 Dec 18 | r10        | CheetahsCheetahs | 17 - 21 | ConnachtConnacht |
| 01 Dec 18 | r10        | UlsterUlster | 16 - 12 | Cardiff BluesCardiff Blues |
| 01 Dec 18 | r10        | GlasgowGlasgow | 29 - 20 | ScarletsScarlets |
| 01 Dec 18 | r10        | DragonsDragons | 10 - 59 | LeinsterLeinster |
| |
| 21 Dec 18 | r11        | UlsterUlster | 19 - 12 | MunsterMunster |
| 21 Dec 18 | r11        | Cardiff BluesCardiff Blues | 19 - 16 | DragonsDragons |
| 22 Dec 18 | r11        | OspreysOspreys | 19 - 12 | ScarletsScarlets |
| 22 Dec 18 | r11        | EdinburghEdinburgh | 23 - 7 | GlasgowGlasgow |
| 22 Dec 18 | r11        | LeinsterLeinster | 33 - 29 | ConnachtConnacht |
| 23 Dec 18 | r11        | ZebreZebre | 8 - 10 | BenettonBenetton |
| |
| 28 Dec 18 | r12        | ConnachtConnacht | 21 - 12 | UlsterUlster |
| 29 Dec 18 | r12        | BenettonBenetton | 28 - 10 | ZebreZebre |
| |
| 05 Jan 19 | r13        | BenettonBenetton | 20 - 17 | GlasgowGlasgow |
| 05 Jan 19 | r13        | LeinsterLeinster | 40 - 7 | UlsterUlster |
| |
| 18 Jan 19 | r11        | Southern KingsSouthern King | 17 - 24 | CheetahsCheetahs |
| |
| 25 Jan 19 | r14        | UlsterUlster | 17 - 17 | BenettonBenetton |
| |
| 06 Apr 19 | r19        | LeinsterLeinster | 27 - 27 | BenettonBenetton |
| 07 Apr 19 | r19        | Southern KingsSouthern King | 18 - 18 | DragonsDragons |
| |
| 04 May 19 | r00        | MunsterMunster | 15 - 13 | BenettonBenetton |
| 04 May 19 | r00        | UlsterUlster | 21 - 13 | ConnachtConnacht |
| 18 May 19 | r00        | OspreysOspreys | 21 - 10 | ScarletsScarlets |
| 25 May 19 | r00        | GlasgowGlasgow | 15 - 18 | LeinsterLeinster |
| |
| 31 Aug 19 | r01        | Cardiff BluesCardiff Blues | 32 - 33 | LeinsterLeinster |
| 31 Aug 19 | r01        | OspreysOspreys | 17 - 13 | EdinburghEdinburgh |
| 31 Aug 19 | r01        | ZebreZebre | 32 - 16 | Southern KingsSouthern King |